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West Elk Mine 2006 Annual Hydrology Report 44 <br />elevated total iron content of 6.06 mg/1 compared to the maximum baseline value of 1.07 mg/1 and <br />- elevated pH of 8.3 s.u. compared to the maximum baseline of 7.6 s.u.. Well SOM 45-H-2 has a <br />slightly elevated pH of 8.6 s.u. compared to the maximum baseline of 8.2 s.u. SOM C-76 had <br />elevated dissolved iron of 0.75 mg/1 compared to the maximum baseline value of 0.13 mg/1 and <br />elevated total iron of 8.44 mg/1 compared to the maximum baseline of S.O1 mg/l. We1123-H-3 had <br />slightly elevated conductivity of 2,210 µmhos/cm compared to the maximum baseline value of <br />2,170 µmhos/cm and elevated zinc of 0.05 mg/1 compared to the maximum baseline of 0.04 mg/1. <br />Well 03-11-1 had slightly elevated conductivity of 3,120 µmhos/cm compared to the maximum <br />baseline value of 2,730 µmhos/cm, total iron of 1.89 mg/1 compared to the maximum baseline of <br />0.49 mg/l, and phosphate of 0.21 mg/1 compared to the maximum baseline value of 0.09 mg/1. <br />Well SOM 3E had slightly elevated conductivity of 2,190 µmhos/cm compared to the maximum <br />baseline value of 2,090 µmhos/cm and elevated pH of 8.7 s.u. compared to the maximum baseline <br />of 8.4 s.u.. Well 96-2-2 had slightly TDS of 2,870 mg/1 compared to the maximum baseline of <br />2.830 mg/1 and dissolved iron of 0.13 mg/1 compared to the maximum baseline of 0.06 mg/l. Well <br />RAV 4B had slightly elevated conductivity of 4,430 µmhos/cm compared to the maximum baseline <br />value of 2,700 µmhos/cm and elevated total iron of 333 mg/1 compared to a maximum baseline <br />value of 22.5 mg/1, TDS of 2,450 mg/1 compared to the maximum baseline of 1,710 mg/1, and pH <br />of 9.0 s.u. compared to the maximum baseline of 8.9 s.u.. Well 1-11-01 elevated total iron of 4.59 <br />mg/1 compared to a maximum baseline value of 0.99 mg/1 and phosphate of 0.58 mg/1 compared to <br />the maximum baseline of 0.16 mg/1. Well SOM-3B had a slightly elevated conductivity of 5,350 <br />µmhos/cm compared to the maximum baseline value of 3,070 µmhos/cm, phosphate of 0.99 mg/1 <br />compared with the maximum baseline value of 0.086 mg/1, pH of 8.5 s.u. compared to the <br />maximum baseline of 7.9 s.u., sodium of 1,620 mg/1 compared with the maximum baseline value <br />of 992 mg/l, boron of 3.37 mg/1 compared with the maximum baseline value of 1.58 mg/1 and TDS <br />of 3,780 mg/1 compared with the maximum baseline value of 2,370 mg/1. Many of these values are <br />suspect or very close to baseline values and there is no apparent indication that these water quality <br />changes are attributed to mining operations and no additional changes are expected in WY 2007. <br />The shallow colluvial monitoring Well GP-4 went dry in WY 2002 and continued to be dry <br />throughout WY 2005. Wells GP-3 and RPE-7 went dry in WY 2004 and did not rebound in WY <br />2005, even with higher than average precipitation. The water level drop in these wells may be due <br />to the up-gradient diversion of surface water runoff in the area. <br />Well SOM-45-H-1 and Well SOM-45-H-2 have been affected by the underlying longwall mining <br />in Panel 13. These wells are completed in the barren member of the Mesaverde Formation above <br />the F Seam respectively. The interburden between this horizon and the mined interval is about 800 <br />December 2007 HydPOGeo, Inc. <br />